Improvement in motive-power apparatus



f @sind didnt THOMAS-DAVIS,` OF DETROIT,` MICHIGAN.

Letters Patent No. 1110.212. dated December 20, 1870.

IMPROVEMENT 'IN MOTIVE-POWER APPARATUS.

The Schedule referred to in these Letters Patent and melding part of the same.

' To whom. it may concern Be it known that I, THOMAS Davis, yof Detroit, in the county of Tayne and State of Michigan, have invented a new and useful Improvement in a lVedge- Power; and I do declare that the following is a true and accuratedescription thereof, reference being had tothe accompanying drawing and to the letters of refpei-ence marked thereon and being a part of this specif tcation, in which--V r Figure l is a side elevation'of my device, with the near side plate removed.

Figure 2 is a plan of the chain.

Like letters indicate like parts in each figure.A

The nature of this invention relates to a new and novel application ofthe wedge to the raising or moving ot' heavy bodies, and consists in the arrangement `within a suit-able case or frame of friction-rollers, in

pairs, i-n the length of the frame, and in the employment of a. double bar-link chain between the said A rollers, the pivots of .the chain carrying friction-rollers,

the chain' with its load being moved forwardjby wedges successively driven between the rollers of the `frame and those of the chain, giving the latter great tractive power, as more fully hereinafter set forth.

In the drawing- A represents a suitable frame or case, constructed of' two parallel beams joined' together by suitable cross -bars, which may beY .provided with frictionrollers to support the chain, if desired, and as shown.

B are friction-rollers, journaled at equal distances apart in the frame A, and below each is a corresponding one, B'.

C is a bar-link chain, composed of parallel bars, c,

.pivoted together, and each link` to the adjoining one by the cross-bar b, which have sleeved on them friction-rollers c.

sorted and driven, carrying the chain a further distance along,l when the 'first wedge may be withdrawn.

The process is continued until the weight is'moved the desired distance. A

Of Course the frame must be suitably anchored, andthe chain properly secured at its Otherend to the weight to be moved.

.lhe wedges may be forced in by any known means, by screws, levers, or otherwise, and, to prevent theui from ilying out from the great pressure on them, may be securely held, as they are driven, by spring-pawls E arranged on the "side beams of the frame A, to engage witl1-notel1es cut in the sides of the wedges. n y

.It will readily be seen that this arrangement affords an enormous power at a small cost, applicable `to many plllpOSeS.

What I claim as my invention, and desire to se- 

